Kama is an Assassin-class Pseudo-Servant summoned by Ritsuka Fujimaru in Fate/Grand Order. She manifests in Sakura Matou's body, though the Hindu god of love is traditionally male. Her appearance here seems tied to Sakura's nature and connections to another goddess also operating as a Pseudo-Servant.
In mythology, Kama—also called Kamadeva—wields a sugarcane bow strung with flower-adorned arrows. Anyone hit by one falls into desire or love, which is basically his whole thing. He's best known for the legend where he shot Shiva during one of the god's deep meditation sessions, trying to get him to notice his wife Parvati. (Shiva, uh, did not take that well, but that's another story.)
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